U.S. patent application number 13/878908 was filed with the patent office on 2013-08-15 for method and device for blow moulding containers.
This patent application is currently assigned to KHS CORPOPLAST GMBH. The applicant listed for this patent is Rolf Baumgarte, Marco Bohnke, Frank Haesendonckx, Dieter Klatt, Gerhard Klopper, Frank Lewin, Michael Litzenberg, Carlo Striebel. Invention is credited to Rolf Baumgarte, Marco Bohnke, Frank Haesendonckx, Dieter Klatt, Gerhard Klopper, Frank Lewin, Michael Litzenberg, Carlo Striebel.
Application Number | 20130207319 13/878908 |
Document ID | / |
Family ID | 45896049 |
Filed Date | 2013-08-15 |
United States Patent
Application |
20130207319 |
Kind Code |
A1 |
Haesendonckx; Frank ; et
al. |
August 15, 2013 |
METHOD AND DEVICE FOR BLOW MOULDING CONTAINERS
Abstract
The method and the device are used to blow mould containers. A
parison is transformed into the container after thermal
conditioning within a blow mould of a blow moulding machine by the
action of blowing pressure. In order to adjust to a contour of the
container to be produced, prior to the moulding of the container,
at least a part of a first blow mould is first removed from the
blow station and replaced by at least a part of a second blow
mould. Betbre the part of the first blow mould is removed, a
locking device which fixes this part in the blow station is
released and after the insertion of the part of the second blow
mould said locking device is again positioned for fixing the part
of the second blow mould. Each locking device is coupled to an
operating element.
Inventors: |
Haesendonckx; Frank;
(Hamburg, DE) ; Bohnke; Marco; (Mollagen, DE)
; Klatt; Dieter; (Hamburg, DE) ; Baumgarte;
Rolf; (Ahrensburg, DE) ; Striebel; Carlo;
(Hamburg, DE) ; Klopper; Gerhard; (Hamburg,
DE) ; Litzenberg; Michael; (Geesthacht, DE) ;
Lewin; Frank; (Tangstedt, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Haesendonckx; Frank
Bohnke; Marco
Klatt; Dieter
Baumgarte; Rolf
Striebel; Carlo
Klopper; Gerhard
Litzenberg; Michael
Lewin; Frank |
Hamburg
Mollagen
Hamburg
Ahrensburg
Hamburg
Hamburg
Geesthacht
Tangstedt |
|
DE
DE
DE
DE
DE
DE
DE
DE |
|
|
Assignee: |
KHS CORPOPLAST GMBH
Hamburg
DE
|
Family ID: |
45896049 |
Appl. No.: |
13/878908 |
Filed: |
October 13, 2011 |
PCT Filed: |
October 13, 2011 |
PCT NO: |
PCT/DE11/01859 |
371 Date: |
May 1, 2013 |
Current U.S.
Class: |
264/530 ;
425/541 |
Current CPC
Class: |
B29C 49/48 20130101;
B29C 2049/4864 20130101; B29C 49/12 20130101; B29K 2067/003
20130101; B29C 49/56 20130101; B29C 2049/566 20130101; B29C 49/06
20130101; B29K 2023/12 20130101; B29D 22/003 20130101 |
Class at
Publication: |
264/530 ;
425/541 |
International
Class: |
B29D 22/00 20060101
B29D022/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 13, 2010 |
DE |
10 2010 048 663.9 |
Claims
1. A method for blow molding of containers, in which preforms,
after thermal conditioning, are reshaped into the containers by
blowing pressure within a blow mold of a blowing station of a blow
molding machine, and where for the adjustment to a contour of the
containers to be produced, at least a part of a first blow mold is
removed from the blowing station and is replaced by at least a part
of a second blow mold, and wherein before removal of the part of
the first blow mold, a fastening that fixes the part of the first
blow mold to the blowing station is unlocked, and after insertion
of the part of the second blow mold, said fastening is again
positioned for fixing the part of the second blow mold to the
blowing station, and wherein said fastening is coupled with an
adjusting element.
2. The method according to claim 1, wherein the blowing station is
opened before the fastening is unlocked.
3. The method according to claim 1, wherein the blowing station is
opened during a turning motion of the blow wheel by positioning a
curve segment manually or automatically so that when the blow wheel
is turned, the blowing station is opened.
4. The method according to claims 1, wherein before the fastening
is unlocked a blow nozzle is positioned.
5. The method according to claim 4, wherein the blow nozzle is
positioned during a turning motion of the blow wheel by positioning
a curve segment so that when the blow wheel is turned, the blow
nozzle is positioned.
6. The method according to claim 1, wherein a fastening of a base
form is unlocked.
7. The method according to claim 6, wherein the base form is
connected via at least one coupling with at least one operating
material supply.
8. The method according to claim 1, wherein a support for the base
form is mechanically coupled with form carriers of the blowing
station so that a motion coupling is implemented.
9. The method according to claim 1, wherein the adjusting element
is manually actuated.
10. The method according to claim 1, wherein the adjusting element
is actuated by a controllable actuator.
11. A device for blow molding of containers that comprises at least
one blowing station with a blow form, wherein the blow mold
consists of at least two parts that can be fixed by at least one
fastening in an area of the blowing station, wherein the fastening
is coupled with at least one actuating mechanism, wherein the
fastening is coupled with an adjusting element.
12. The device according to claim 11, wherein adjacent to the blow
wheel a positionable curve segment is placed for presetting an
opening of the blower station.
13. The device according to claim 11, wherein adjacent to the blow
wheel a positionable curve segment is placed for presetting a
positioning of the blow nozzle.
14. The device according to claim 11, wherein the base form
exhibits at least one coupling for connection to an operating
material supply.
15. The device according to claim 11, wherein a support of the base
form is mechanically coupled with carriers of the blow mold.
16. A method for adjusting a contour of containers produced by blow
molding in which thermally conditioned preforms are reshaped into
containers by blowing pressure within a blow mold of a blowing
station of a blow molding machine, the method comprising: unlocking
a fastening that fixes at least a part of a first blow mold to the
blowing station; removing the part of the first blow mold from the
blowing station; replacing the part of the first blow mold with at
least a part of a second blow mold; and relocking the fastening
such that it fixes the part of the second blow mold to the blowing
station; wherein said fastening is coupled with an adjusting
element that allows the removal of the first part of the blow mold
and replacement of the second part of the blow mold without using
tools.
Description
[0001] The invention relates to a method for blow molding of
containers, in which within a blow mold of a blowing station of a
blow molding machine preforms after their thermal conditioning are
reshaped into the container by blowing pressure, and where for the
adjustment to a contour of the container to be produced, first at
least a part of a first blow mold is removed from the blowing
station and replaced by at least a part of a second blow mold, and
wherein before removal of the part of the first blow mold, a
fastening that fixes this part of the blow mold is unlocked, and
after insertion of the part of the second blow mold, said fastening
is again positioned for fixing the part of the second blow
mold.
[0002] In addition the invention relates to a device for blow
molding of containers that exhibits at least one blowing station
with a blow form, as well with the blow mold consisting of at least
two parts, that can be fixed by at least one fastening in the area
of the blowing station, wherein the fastening is coupled with at
least one actuating mechanism.
[0003] In the formation of containers through blowing pressure,
preforms made of a thermoplastic material, for example preforms
made of PET (polyethylene terephthalate), are fed within a blowing
machine to various processing stations. Typically such a blowing
machine exhibits a heating device and a blowing device, in the area
of which the previously tempered preform is expanded through
biaxial orientation into a container. The expansion occurs with the
aid of compressed air which is injected into the preform to be
expanded. The procedure with such an expansion of the preform is
explained in DE-OS 43 40 291. The injection of pressurized gas,
mentioned at the outset, also comprises compressed gas injection
into the developing container bubble as well as compressed gas
injection into the preform at the start of the blowing process.
[0004] The basic design of a blowing station for forming containers
is described in DE-OS 42 12 583. Possibilities for heat-treating
the preforms are explained in DE-OS 23 52 926.
[0005] Within the device for blow forming, the preforms as well as
the blown-up containers can be transported with the aid of various
handling devices. The use of transport mandrels, on which the
preforms can be placed, has proven itself in particular. However,
the preforms can also be handled by other carrying devices. Use of
gripping tongs for handling preforms and the use of expanding
mandrels which can be inserted for securing in a mouth area of the
preform, also are among the available designs.
[0006] Handling the containers while using transfer wheels is
described, for example, in DE-OS 199 06 438 for an arrangement of
the transfer wheel between a blow wheel and an output segment.
[0007] The preforms are handled, as already explained, in a
so-called dual-stage procedure, in which the preforms first are
produced in an injection molding procedure, then placed in
intermediate storage, and only later heat-treated and blown up into
a container. Or, a so-called single-stage procedure is used, in
which the preforms are suitably heat-treated immediately after
being manufactured by injection molding and a sufficient
solidification and then are blown up.
[0008] In regard to the blowing stations used, various embodiment
forms are known. With blowing stations that are arranged on
rotating transport wheels, it is often seen that the form carriers
can be opened up in book fashion. But it is also possible to use
form carriers that can be slid relative to each other or guided by
some other means. With positionally fixed blowing stations that are
especially well suited to admit multiple cavities for forming
containers, typically plates are used as form carriers, arranged
parallel to each other.
[0009] High-capacity blowing machines exhibit a considerable output
of bottles per unit of time. With machines having such productive
capacities, this output currently can reach up to an order of
magnitude of about 80,000 bottles per hour.
[0010] With many applications, the operator of such a blowing
machine makes various end products, and for it needs variously
shaped blown containers. Therefore, the overall output capacity of
high-capacity machines over several days often exceeds the specific
demand for a certain number of blown containers. Therefore, the
blowing stations of blowing machines are constructed so that the
blow forms can be changed out in part or as a whole. After such a
changeover, the blowing machine in question can then produce
containers that are shaped differently or have different
dimensions.
[0011] Especially with large blowing machines, which often exhibit
20 to 40 blowing stations, which are arranged on a rotating blow
wheel, changeover of blow molds or of parts of blow molds proves to
be labor-intensive.
[0012] A typical design of blowing stations is such that initially
they exhibit mechanically relatively stable exterior form carriers,
which, depending on the design, can be locked against each other,
or which can be used unlocked. In these outer form carriers, often
exterior shell molds are used, which are of a relatively universal
design and as a rule are not replaced even when a form is changed.
In addition, interior shell molds are used which possess an inner
contour that is adjusted to the container to be manufactured. These
interior shell molds are then detachably fixed in the area of the
exterior shell molds.
[0013] One typical such design is described in EP 0 821 641 A. Here
the exterior shell molds are screw-connected with the form
carriers, and movable lashes are placed in lateral areas of the
exterior shell molds. When the interior shell molds are changed
out, the screws securing the lashes are loosened, and the lashes
are shifted outwards. Then the particular interior shell mold can
be removed and changed out by another shell mold. Then the lashes
again are shifted inwards and again secured. After a blowing
station is opened, thus four screws must be loosened in the area of
each blowing station, four lashes must be shifted, and then
re-positioned again and then the four screws are again
tightened.
[0014] A fastening device that is substantially simplified as
regards handling is described in WO 2007/12308. Here, using a
manual lever, a fastening is released and again fixed, which
provides both a form-locking and a force-locking. With use in a
design with interior shell molds and with exterior shell molds, an
entire side of the interior shell mold can be released relative to
the exterior shell mold in one operational step, or again
fixed.
[0015] In regard to making production down-times due to mold
changeouts as brief as possible, the previously known processes and
devices cannot meet all the requirements set for minimizing
changeout time.
[0016] Therefore the object of the present invention is to improve
a method of the type mentioned initially, to reduce changeout time
when a form changeout process is carried out.
[0017] This problem is solved according to the invention in that
every fastening device is coupled with an adjusting element.
[0018] A further object of the present invention is to design a
device of the type named initially so that changeout times can be
reduced when a form is changed.
[0019] This problem is solved according to the invention in that
every fastening device is coupled with an adjusting element.
[0020] Owing to the coupling of each fastening device used with an
adjusting element, it is possible to change out the form without
using tools. Depending on the particularly automation stage
desired, it is possible to configure all or some of the adjusting
elements as manually operable levers or handles. In a more heavily
automated embodiment form, at least some of the adjusting elements
can be implemented as actuators, for example as pneumatically or
hydraulically activated cylinders or as electric motors.
[0021] The particular embodiment forms to be implemented are
selected depending on a specifically desired reduction in changeout
times and in dependence on expense for devices viewed as
justifiable.
[0022] In one economical version of facilitation of form changeout
without tools, all the adjusting elements are implemented as
manually operable elements, while with a very extensive automation,
as large as possible a number of the adjusting elements are
designed as actuators, which preferably can be operated from a
control device of the machine. However, mixed usage may be made of
both manually operated controls and controllable actuators.
[0023] The mechanical sequences can be advantageously coordinated
in connection with a loosening of the fastening device in that
before loosening of the fastening, the blowing station is
opened.
[0024] The motion can be made to be repeatable and robust in that
the blowing station is opened during a turning movement of the blow
wheel through a curved segment capable of being positioned.
[0025] For further preparation of a required working space, it is
recommended that a blowing nozzle be positioned before unlocking
the fastening.
[0026] One appropriate structural implementation consists in
positioning the blow nozzle during a turning motion of the blowing
wheel through a curved segment.
[0027] For further adaptation to the container to be produced, it
is suggested that a fastening of a base form be released.
[0028] The required operating time can be further reduced by having
the base form be connected via at least one coupling with at least
one operating-material supply.
[0029] A simplified mechanical design is made available in that a
support for the base form is mechanically coupled with form
carriers of the blowing station so that a motion-coupling is
implemented.
[0030] One economical embodiment form can be achieved in that the
adjusting element is manually controlled.
[0031] An intensified degree of automation is facilitated in that
the adjusting element is operated by a controllable actuator.
[0032] The drawings are schematic depictions of embodiment examples
of the invention.
[0033] Shown are:
[0034] FIG. 1 A perspective view of a blowing station for
production of containers from preforms.
[0035] FIG. 2 A longitudinal section through a blow mold, in which
a preform is stretched and expanded.
[0036] FIG. 3 A sketch to clarify a basic design of a device for
blow forming of containers.
[0037] FIG. 4 A modified heating section with an expanded heating
capacity.
[0038] FIG. 5 A perspective view of a blow wheel with some mounted
blowing stations as well as a separate control device to facilitate
form changeout without tools
[0039] FIG. 6 A perspective view of exterior shell molds with
actuators for operating a fastening for fixing of interior shell
molds not depicted.
[0040] FIG. 7 A manually operable fastening element for fixing and
release of interior shell molds.
[0041] FIG. 8 An exterior view in perspective of an exterior shell
mold.
[0042] FIG. 9 A perspective view of exterior shell molds with
inserted interior shell molds.
[0043] FIG. 10 A perspective view of a device for positioning of a
base form.
[0044] FIG. 11 A fastening for a base form, wherein the fastening
is equipped with a manual lever.
[0045] FIG. 12 The arrangement as per FIG. 11 after replacement of
the manual lever by an automatically operable adjusting
element.
[0046] FIG. 13 A perspective view of a device with a curved segment
that can be positioned for lifting and lowering a form.
[0047] FIG. 14 A schematic perspective top-down view of the
operating device depicted in FIG. 5 for facilitating changeout of
the form without tools.
[0048] The main design of a device for reshaping of preforms (1)
into containers (2) is depicted in FIG. 1 and in FIG. 2.
[0049] The device for shaping the container (2) essentially
consists of a blowing station (3), which is equipped with a blow
mold (4), into which a preform (1) can be inserted. The preform (1)
can be an injection-molded part made of polyethylene terephthalate.
To make it possible to insert the preform (1) into the blow mold
(4), and to make it possible to remove the completed container (2),
the blow mold (4) consists of form halves (5, 6) and a base part
(7), which is able to be positioned by a lifting device (8). The
preform (1) can be held in the area of the blowing station (3) by a
transport mandrel (9), which, jointly with the preform (1), passes
through a plurality of treatment stations within the device.
However, it is also possible to insert the preform (1) by tongs,
for example, or other handling devices, directly into the blow mold
(4).
[0050] To make it possible to apply pressure, beneath the transport
mandrel (9) an attaching piston (10) is placed, which feeds
compressed air to the preform (1) and simultaneously seals it
relative to the transport mandrel (9). In an altered design,
however, it is in principle also conceivable to use fixed
compressed air supply lines.
[0051] With this embodiment example, the preform (1) is stretched
with the aid of a stretching rod (11) which is positioned by a
cylinder (12). According to another embodiment form, the stretching
rod (11) is mechanically positioned via curved segments which are
impinged on by tapping rollers. Employing curved segments is
especially appropriate if a plurality of blowing stations (3) is
arranged on a rotating blow wheel.
[0052] In the embodiment form depicted in FIG. 1, the stretching
system is configured so that a tandem arrangement of two cylinders
(12) is provided. From a primary cylinder (13) the stretching rod
(11) first is moved before the start of the actual stretching
process to the area of a base (14) of the preform (1). During the
actual stretching process, the primary cylinder (13), with a
deployed stretching rod, is positioned jointly with a slide (15)
bearing the primary cylinder (13) by a secondary cylinder (16) or
via a curve guidance device. The particular thought herein is to
make use of the secondary cylinder (16) in curve-guided fashion so
that by a guide roller (17), which glides along a curved path when
the stretching process is being carried out, a current stretching
position is preset. The guide roller (17) is pressed by the
secondary cylinder (16) against the guide path. The slide (15)
glides along by two guiding elements (18).
[0053] After closing of the form halves (5, 6) arranged in the area
of the carriers (19, 20), the carriers (19, 20) are locked relative
to each other with the aid of a locking device (40).
[0054] For adapting a mouth section (21) of the preform (1) to
various shapes, according to FIG. 2 provision is made to use
separate threading inserts (22) in the area of the blow mold
(4).
[0055] In addition to the blown container (2), drawn in on FIG. 2
in dashed lines is the preform (1), and also, schematically, a
developing container bubble (23).
[0056] FIG. 3 shows the basic design of a blowing machine, which is
equipped with a heating segment (24) and a rotating blow wheel
(25). Proceeding from an input of preforms (26), the preforms (1)
are transported by transport wheels (27, 28, 29) into the area of
the heating segment (24). Along the heating segment (24), radiant
heaters (30) and fans (31) are arranged, to provide heat treatment
of the preforms (1). After the preforms (1) have been sufficiently
heat-treated, these are passed to the blow wheel (25), in the area
of which the blowing stations (3) are arranged. The already blown
containers (2) are delivered by further transfer wheels to an
output segment (32).
[0057] To be able to reshape a preform (1) into a container (2), so
that the container (2) has material properties that ensure that the
foodstuffs, especially drinks, filled within the container (2) will
be able to be used over a long period, special procedural steps
must be complied with during heating and orientation of the
preforms(1). In addition, advantageous effects may be attained by
complying with special guidelines for setting dimensions.
[0058] Various plastics can be used as thermoplastic material. For
example, PET, PEN or PP can be employed.
[0059] The preform (1) is expanded during the orientation process
by injection of compressed air. The supply of compressed air is
divided in a pre-blowing phase in which gas, for example compressed
air, is fed in at a low pressure level, and in a subsequent main
blowing phase in which the gas is fed in at a higher pressure
level. During the pre-blowing phase, typically the compressed air
is used at a pressure in an interval from 10 bar to 25 bar, and
during the main blowing phase compressed air it is fed in at a
pressure in an interval from 25 bar to 40 bar.
[0060] Also perceptible from FIG. 3 is that with the depicted
embodiment form, the heating segment (24) is formed from a
plurality of circulating transport elements (33) that are in
chain-like rows one next to the other, and are guided along
deflection wheels (34).
[0061] Especially what is conceived of there is, through the
chain-like arrangement, to set an essentially rectangular base
contour. In the embodiment form depicted, in the area of the
extension of the heating segment (24) that faces the transport
wheel (29) and an input wheel (35), a deflection wheel (34) of
relatively large dimension, and in the area of the adjoining
deflections, two deflection wheels (36) with relatively smaller
dimensions, are used. However, in principle any other guidance
devices are conceivable.
[0062] To make it possible to place the transport wheel (29) and
the input wheel (35) relative to each other so as to adjoin as
tightly as possible, the depicted arrangement proves to be
especially appropriate, since in the area of the corresponding
extension of the heating segment (24) three deflection wheels (34,
36) are positioned, and in particular the smaller deflection wheels
(36) in the area of the transition to where the heating segment
(24) runs in linear fashion and the larger deflection wheel (34) in
the immediate area of transition to the transport wheel (29) and to
the input wheel (35). As an alternative to use of chain-like
transport elements (33) it is for example also possible to employ a
rotating heating wheel.
[0063] After the containers (2) have been blown to completion, they
are taken out by a removal wheel (37) from the area of the blowing
stations (3) and transported via the transport wheel (28) and a
release wheel (38) to the release segment (32).
[0064] In the modified heating segment (24) depicted in FIG. 4, via
the larger number of radiant heaters (30), a larger number of
preforms (1) can be heat-treated per unit of time. Here the fans
(31) direct cooling air into the area of cooling air channels (39),
which lie opposite the assigned radiant heaters (30) and release
cooling air via ejection openings. Through the arrangement of
ejection openings, a flow direction is implemented for the cooling
air essentially transverse to a transport direction of the preforms
(1). The cooling air channels (39) can also make available
reflectors for the thermal radiation in the area of the surfaces
opposite the thermal radiators (30); it is likewise possible via
the emitted cooling air to implement cooling of the radiant heaters
(30).
[0065] FIG. 5 is a perspective depiction of the blow wheel (25)
with three already-mounted blowing stations (3). Also perceived is
an operating device (41) to start the beginning of a form
changeover without tools and to end this operating procedure. In
addition, a curved segment (42) able to be positioned is
recognizable, which, in an operational position, presets an opening
of the blowing station (3) when the blowing wheel (25) makes a
rotational movement. The curved segment (42) can be positioned
pneumatically, for example. FIG. 5 also shows the placement of two
ID units (43, 44). For example, units (43, 44) can identify the
blow mold (4) or parts of the blow mold (4) and transmit
appropriate information to the machine control device. It can for
example be identified through mechanical coding, by a transponder
or other identification elements that can for example be detectable
electrically or optically.
[0066] For example, the identification can check the matching of
individual form parts and/or to check whether the form parts
correspond to a production version selected via the machine control
device.
[0067] Also drawn in on FIG. 5 is a curve segment (65) able to be
positioned, which positions a blow nozzle relative to blow mold
(4). The curve segment (65) in question is explained in still
greater detail in connection with FIG. 13.
[0068] FIG. 6 is a perspective depiction of two exterior shell
molds, which are provided for assembly in the area of the carriers
(19, 20). One or more adjusting elements (47) are arranged at the
side on exterior shell molds (45, 46). The adjusting elements (47)
can be configured as pneumatic cylinders and do positioning of a
fastening element not shown in FIG. 6 for fixing of interior shell
molds, likewise not shown, relative to the exterior shell molds
(45, 46).
[0069] FIG. 7 is a perspective depiction of a fastening element
(48) for fixing of the interior shell molds. Here the fastening
element is coupled with an adjusting element which is configured as
a manual lever (49). Here the manual lever is configured as a
rocker arm, which manually positions the fastening element (48) in
a longitudinal direction (50), hereby undertaking a fixing of the
interior shell mold or releasing it again.
[0070] In the embodiment example shown, the manual lever (49) is
designed as a knee lever, which exhibits a locking bolt (51).
[0071] FIG. 8 is an exterior perspective depiction of an interior
shell mold (52). Also perceptible is a base part (7) of the blow
mold (4), which is equipped with a multiple coupling (53). The
multiple coupling (53) feeds at least one heating or cooling medium
to the base part (57).
[0072] FIG. 9 is a perspective depiction of two exterior shell
molds (45, 46) with two assigned interior shell molds (52). Again
adjusting elements (47) are to be seen.
[0073] A lifting mechanism (54) is provided for positioning of the
base part (7).
[0074] In addition, a distributor block (55) is recognizable for
cold water and hoses (56) for the blowing station (3).
[0075] FIG. 10 clarifies the design of a blowing station (3), in
which a knee lever is used for opening and closing the blowing
station (3). Also perceived are the form carriers (19, 20) along
with the exterior shell molds (45, 46).
[0076] For positioning of the base part (7) a slide (58) is used.
The slide (58) is positioned using a curve (59).
[0077] The blowing station (3) carries out opening and closing
motions while employing a curve roller (60). The motion of the base
form (7) and the opening motion of the carriers (19, 20) are
coupled while using a coupling lever (61).
[0078] FIG. 11 shows a fastening device for the base form (7) that
is loosened and fixed without tools. Here an adjusting element (47)
is configured as a manually operable hand lever. Also to be
perceived are the slide (58) and an axle (63) for positioning of
the base form (7). A locking bolt (64) is employed for presetting
the retention of a selected locked or loosened state.
[0079] FIG. 12 shows a variation of the embodiment form in FIG. 11.
According to the embodiment form in FIG. 12, the adjusting element
(47) is configured as a pneumatic pivoting cylinder. Preferably as
a pivoting cylinder with a limit switch.
[0080] FIG. 13 shows a curve segment (65) for positioning a blow
nozzle. The curve segment (65) is able to be positioned by an
adjusting element (66). The adjusting element (66) can be a manual
adjusting device; with the embodiment example depicted, a pneumatic
adjustment is used that is governed by a valve (67). The valve (67)
as well as the pneumatic adjusting element (66) are suitably
positioned by a holder (68).
[0081] FIG. 14 shows the control device (41) with four control
buttons. One control button is provided to start the changeover
process and another control button is provided to finish the
changeover process. In addition, there is a control button to carry
out a reset and for an emergency stop.
[0082] Typically parts of the blow mold (4) or the entire blow mold
(4) are changed out in that at least in a provided operating
position, access is provided for an operator to the blow wheel
(25), for example by opening a door in the machine covering. Then
the curve segment for opening the blowing station (39) is
positioned manually or automatically so that when the blow wheel
(25) is turned, the blowing station (3) is opened in the area of
the working position of the operator. Typically, simultaneous to
opening the blowing station (3), the base form (7) is positioned,
for example by mechanical coupling with the opening movement of the
blowing station (3).
[0083] Simultaneous to the positioning of the curve segment of the
blowing station (3), the curve segement (65) is also suitably
placed for positioning of the blow nozzle. Then preferably the blow
wheel (25) is moved forward in timed fashion, so that one after the
other the individual blowing stations are positioned, opened, in
the area of the operator. By manual unlockings, the operator can
then actuate manual fastening elements; if with an automatic
unlocking, pneumatic cylinders, hydraulic cylinders or electric
motors unlock the parts of the blow mold (4) to be removed. Then
the operator can remove the part of the blow mold (4) in question
and change it out with another part provided. After insertion of
the new blow mold part, the processes described occur in reverse
order.
[0084] According to one embodiment example, the individual handling
processes of the operator are facilitated optically by illumination
of the elements to be operated. For example, with a so-called laser
pointer or with a light spot.
* * * * *